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Problems


IDDescription / TitleSolved By
201Subsets with a unique sum
1272
202Laserbeam
1460
203Squarefree Binomial Coefficients
5262
204Generalised Hamming Numbers
4322
205Dice Game
8258
206Concealed Square
11986
207Integer partition equations
2875
208Robot Walks
1011
209Circular Logic
1514
210Obtuse Angled Triangles
1022
211Divisor Square Sum
2309
212Combined Volume of Cuboids
855
213Flea Circus
1336
214Totient Chains
3107
215Crack-free Walls
2219
216Investigating the primality of numbers of the form 2n2-1
2336
217Balanced Numbers
882
218Perfect right-angled triangles
1806
219Skew-cost coding
928
220Heighway Dragon
1480
221Alexandrian Integers
1264
222Sphere Packing
1286
223Almost right-angled triangles I
854
224Almost right-angled triangles II
717
225Tribonacci non-divisors
2641
226A Scoop of Blancmange
1113
227The Chase
1229
228Minkowski Sums
855
229Four Representations using Squares
893
230Fibonacci Words
1832
231The prime factorisation of binomial coefficients
3264
232The Race
1052
233Lattice points on a circle
1152
234Semidivisible numbers
2102
235An Arithmetic Geometric sequence
3233
236Luxury Hampers
616
237Tours on a 4 x n playing board
941
238Infinite string tour
639
239Twenty-two Foolish Primes
1124
240Top Dice
1368
241Perfection Quotients
575
242Odd Triplets
662
243Resilience
4807
244Sliders
811
245Coresilience
527
246Tangents to an ellipse
520
247Squares under a hyperbola
909
248Numbers for which Euler’s totient function equals 13!
784
249Prime Subset Sums
1432
250250250
1655